Other Idaho Vehicle Registrations

Beyond the standard passenger-car registration handled at the county assessor's office, Idaho registers a range of other vehicle types — trailers, motorcycles, off-highway vehicles, RVs, snowmobiles, and antique cars — each with its own fee schedule, plate program, and seasonal rules. The same county assessor's office handles most of these transactions; off-highway vehicles and snowmobiles share a registration program operated jointly with the Idaho Department of Parks and Recreation.

Motorcycles

Motorcycles register at the county assessor's office using the same ITD-3367 and ITD-3260 forms as passenger vehicles. Motorcycle registration fees are lower than full-size cars, and motorcycles are not subject to the Treasure Valley emissions program. To operate a motorcycle on Idaho roads, the rider must hold a Class M endorsement on their Idaho driver's license, which requires a separate motorcycle skills test or an Idaho STAR rider course completion certificate.

Trailers

Idaho registers utility trailers, boat trailers, and travel trailers individually based on weight class. Light utility trailers under a certain GVWR can be registered for an extended cycle (up to 8 years) for a flat fee, which is unusual nationally and saves significant paperwork for owners with several trailers. Heavier trailers, including travel trailers and large equipment trailers, follow an annual or biennial cycle. All trailers used on public roads must display Idaho plates and a current registration sticker.

Off-highway vehicles (OHVs)

Idaho's Off-Highway Vehicle (OHV) Program covers ATVs, motorbikes used off-road, side-by-sides (UTVs), and similar vehicles. OHV registration is handled jointly by the assessor's office and the Idaho Department of Parks and Recreation; the registration sticker is required to operate on public lands, state trails, and BLM-managed routes. The annual sticker carries a modest fee, and the program funds Idaho trail maintenance and OHV-friendly recreation areas.

Some Idaho counties also issue an OHV restricted plate that allows certain side-by-sides to operate on public roads adjacent to trails — a "street legal" upgrade that requires headlights, taillights, mirrors, turn signals, and proof of liability insurance. The street-legal upgrade is granted county by county; some Idaho counties allow it, others do not.

Snowmobiles

Snowmobile registration runs through the same OHV program as ATVs and is required for any sled operated on public lands or state trails in Idaho. The annual registration sticker is issued by the assessor's office or by Idaho Parks and Recreation directly. Operators under 16 must complete a state-approved snowmobile safety course before riding without a parent or guardian.

RVs and motorhomes

Self-propelled motorhomes register as passenger vehicles under their motorhome class, with fees based on age and weight. Travel trailers and fifth-wheels register as trailers under the trailer fee schedule. RVs are subject to the standard registration renewal cycle but are exempt from the Treasure Valley emissions test if classified as a recreational vehicle. Carry proof of insurance and a current registration card on every trip.

Antique and old-timer plates

Idaho offers an old-timer plate for vehicles at least 30 years old that are owned as collector items rather than daily drivers. The old-timer plate is a one-time registration with a much lower fee, and the vehicle's use is restricted to club events, parades, exhibitions, and limited pleasure driving. Old-timer plates carry a vintage-look design and a unique numbering series. Vehicles with old-timer plates are exempt from emissions testing.

Specialty plates

Idaho issues dozens of specialty plates — military service, university support, conservation programs, hobbyist groups, and personalized vanity plates. The specialty plate fee includes a portion that goes to the sponsoring program (for example, university scholarships or wildlife funds) on top of the standard registration fee. Specialty plates are personal to the owner and stay with the owner when the vehicle is sold; standard plates stay with the vehicle.

Commercial and farm vehicles

Commercial vehicles operating in interstate commerce register under the International Registration Plan (IRP) through ITD's Commercial Vehicle Services rather than at a county assessor's office. Idaho also offers farm-use license plates for vehicles used substantially in agricultural production. Farm plates carry restrictions on highway miles and travel distance from the home farm but offer a substantial fee discount.